Insted of just commenting how important it is, lets make
it more robust and add a lockdep_assert_held() call.

Signed-off-by: Davidlohr Bueso <[email protected]>
---
 fs/eventpoll.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 347da3f4f5d3..6a0c2591e57e 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1637,6 +1637,8 @@ static __poll_t ep_send_events_proc(struct eventpoll *ep, 
struct list_head *head
         * Items cannot vanish during the loop because ep_scan_ready_list() is
         * holding "mtx" during this call.
         */
+       lockdep_assert_held(&ep->mtx);
+
        list_for_each_entry_safe(epi, tmp, head, rdllink) {
                if (esed->res >= esed->maxevents)
                        break;
-- 
2.16.4

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